Malicious PDF — malware analysis report

Static analysis result for SHA-256 1295055a4c9871d5…

MALICIOUS

PDF

87.0 KB Created: 2021-03-17 05:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04fe950541179bd2325267db630d1bda SHA-1: 475cd429e6fa342425d2c9c03ccbb3fbce18000f SHA-256: 1295055a4c9871d531de27325b360277db91ceddc8a8a192f2e905797a862ffe
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a specific PDF title, directing users to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/123?utm_term=rodney+stark+bearing+false+witness+pdf PDF link annotation
    • http://ita-talia.fun/aoac_2007._01k30i9.pdfIn PDF document text
    • http://domavera.ru/baleadas_honduras_pollo_con_tajadas9hzs6.pdfIn PDF document text
    • http://kikizuzufo.iblogger.org/triangle_classification.pdfIn PDF document text
    • http://gufutaca6.xyz/jatajuxeso4oj6.pdfIn PDF document text
    • http://mobile-media.moscow/what_do_you_mean_by_radicalismiigcq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_405e9d95e1c54a0eaba30bd189f130de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a7cb33-616a-4906-83ac-33982e30b98d/how_to_replace_a_wick_in_kerosene_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c185872-fe8c-413f-82e9-de44aac832ba/successful_coaching_4th_edition_free.pdfIn PDF document text
    • http://lodemeralakutox.epizy.com/charles_proxy_android_setup.pdfIn PDF document text
    • https://b36ad067-21ef-4b17-9055-1dfcbb3fb98c.filesusr.com/ugd/8673ad_63e1664382604c4eaa908963b2a6b0ee.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_9c4c5caa51b846c8b97adaba4ebce35a.pdf?index=trueIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_ac3d456f4cc9467b8ef144cf96af4ce5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2584b910-cea6-4447-a5ed-f0b965832e3c/23314246082.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_d4904349265c4c178c3c2501de3f445b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3a07be-a10f-44bd-a3df-09d52c0167b3/constellation_map_northern_hemisphere_february.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_977a9699cc1148a5a8197d42d79c08ad.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_ad24741c502f429c994979fce5925536.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_1a7c837ef3484a08941fac4a0c0c2642.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_78c5b8262aeb4043b5409d61df36fe9c.pdf?index=trueIn PDF document text
    • http://kumobeba.epizy.com/wow_blacksmithing_guide_tbc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2970effd-1e08-4066-9dc8-e1e46b552ca9/how_much_does_windows_movie_maker_2020_cost.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 5616 bytes
SHA-256: 3aa048d6da6a743a223599e7099b3aae84944084bd9ecb93f5553e59c557ceed
font_01_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 11148 bytes
SHA-256: d9cecff242f7e4a07c8074402b9b740aa41c8a55b02383cd49bb8b6e306b6725